Rule of 72 Calculator
See how many years it takes for money to double or triple at a given rate of return.
Years to double (Rule of 72)
Years to double (exact)
Years to triple (exact)
The formula
The Rule of 72 says years to double is about 72 divided by the yearly return. The exact answer is ln(2) / ln(1 + rate).
Example: at 7% the rule gives 10.3 years, and the exact figure is 10.2 years. Money triples in about 16.2 years.
Frequently asked questions
How accurate is the Rule of 72?
It is very close for returns between about 6% and 10%.
Does it work for inflation?
Yes. At 3% inflation, prices double in about 24 years.
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Last updated October 2026. For information only, not financial advice.